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tunnel decryption using AES-NI

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This commit is contained in:
orignal 2014-05-15 13:10:07 -04:00
parent b4b3ba16cc
commit 11ac6712e7
2 changed files with 32 additions and 0 deletions

28
aes.cpp

@ -325,9 +325,37 @@ namespace crypto
void TunnelDecryption::Decrypt (uint8_t * payload) void TunnelDecryption::Decrypt (uint8_t * payload)
{ {
#ifdef __x86_64__
__asm__
(
// decrypt IV
"movups (%[payload]), %%xmm0 \n"
DecryptAES256(sched_iv)
"movaps %%xmm0, %%xmm1 \n"
// double IV encryption
DecryptAES256(sched_iv)
"movups %%xmm0, (%[payload]) \n"
// decrypt data, IV is xmm1
"block_dt: \n"
"add $16, %[payload] \n"
"movups (%[payload]), %%xmm0 \n"
"movaps %%xmm0, %%xmm2 \n"
DecryptAES256(sched_l)
"pxor %%xmm1, %%xmm0 \n"
"movups %%xmm0, (%[payload]) \n"
"movaps %%xmm2, %%xmm1 \n"
"dec %[num] \n"
"jnz block_dt; \n"
:
: [sched_iv]"r"(m_IVDecryption.GetKeySchedule ()), [sched_l]"r"(m_LayerDecryption.GetKeySchedule ()),
[payload]"r"(payload), [num]"r"(63) // 63 blocks = 1008 bytes
: "%xmm0", "%xmm1", "%xmm2", "cc", "memory"
);
#else
m_IVDecryption.Decrypt ((ChipherBlock *)payload, (ChipherBlock *)payload); // iv m_IVDecryption.Decrypt ((ChipherBlock *)payload, (ChipherBlock *)payload); // iv
m_LayerDecryption.Decrypt (payload + 16, i2p::tunnel::TUNNEL_DATA_ENCRYPTED_SIZE, payload + 16); // data m_LayerDecryption.Decrypt (payload + 16, i2p::tunnel::TUNNEL_DATA_ENCRYPTED_SIZE, payload + 16); // data
m_IVDecryption.Decrypt ((ChipherBlock *)payload, (ChipherBlock *)payload); // double iv m_IVDecryption.Decrypt ((ChipherBlock *)payload, (ChipherBlock *)payload); // double iv
#endif
} }
} }
} }

4
aes.h

@ -176,7 +176,11 @@ namespace crypto
private: private:
ECBDecryption m_IVDecryption; ECBDecryption m_IVDecryption;
#ifdef __x86_64__
ECBDecryption m_LayerDecryption;
#else
CBCDecryption m_LayerDecryption; CBCDecryption m_LayerDecryption;
#endif
}; };
} }
} }